The only evolutionary process that leads to adaptive change is:
A. mutation.
B. migration.
C. natural selection.
D. genetic drift.
E. All of the answer options are correct.
C
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Which of the following choices is the ultimate cause of the ability of male zebra finches to
discriminate between the songs of established neighbors and those of strangers?
a. Cells in a nucleus in the forebrain fire more often when the song of a new male is heard. b. Neurons cease to respond to the sound of an established neighbor. c. Zebra finches are genetically programmed to tolerate territory-holding neighbors but repel invaders. d. Zebra finches are capable of selective learning. e. This adaptation allows males to produce more offspring by saving their energy for real battles.
The cis face of the Golgi complex is most directly involved in which process?
a. synthesizing proteins
b. accepting vesicles from the ER c. packaging molecules in vesicles d. transporting molecules out of the Golgi e. catalyzing the efficient folding of proteins
Stanley Miller's experiments were significant because he demonstrated that _____.
A. the behavior of any molecule containing a carbon atom was fundamentally the same B. under certain circumstances the theory of vitalism was valid C. a variety of simple organic compounds could be spontaneously synthesized from components in Earth's primitive atmosphere D. lightning discharges could produce the molecules previously presumed to have originated in volcanic outgassings E. urea could be synthesized from entirely naturally occurring salts
Which of the following is NOT a phenotypic change typical of transforming cells compared to normal?
a) Change from a differentiated shape to a more stem-like generic shape b) Reduced dependence on external growth signals c) Increased cell-to-cell contact inhibition d) Increased mitotic activity